Desk lamp



FIG. 1 is a front-elevational view of a desk lamp, showing my new designthereof;

FIG. 2 is a rear-elevational view thereof;

FIG. 3 is a left side-elevational view thereof;

FIG. 4 is a right side-elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for a desk lamp, as shown and described.